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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '532a50495d47fa3c266e8d0f203b33639afc055caa86ec2c5a1fbc19de0a2b3f' 
  AND token = '/Pv9u8ibB8vTyd8FoprkaAi2D7ZRbjJYVnMgYEC6+ak=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}